CE3150①②
INTRODUCTION:
FEATURES:
The CE3150 is a complete constant-current constant-voltage linear charger for single cell Li-Ion batteries. It’s SOT package and low external component count make the CE3150 especially well-suit for portable applications. Furthermore, the CE3150 is specifically designed to work within USB Power specifications.
No external sense resistor is needed and no blocking diode is required due to internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature. The charge voltage is fixed at 4.2V and the charge current can be programmed externally with a single resistor. The CE3150 automatically terminates the charge cycle when the charge current drops to 1/10th the pr
ogrammed value after the final float voltage is reached. The CE3150 automatically re-starts the charge if the battery voltage falls below an internal threshold.
z  Programmable Charge Current Up to 800mA z  No External MOSFET, Sense Resistor or
Blocking Diode Required
z  Charges Single Cell Li-Ion Batteries Directly
from USB Port
z  Preset 4.2V Charge Voltage with ±1%
Accuracy
z  Constant-Current/Constant-Voltage
Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
z  Charge Status Output Pin z  30μA Shutdown Current
z  70μA Standby Current
z  Complete Linear Charger in SOT23-5
Package for Single Cell Lithium-Ion Batteries z  C/10 Charge Termination z  Soft-Start Limits Inrush Current z  Automatic Recharge
APPLICATIONS ：
z  Cellular Telephones, PDAs z  Charging Docks and Cradles
z  Portable MP3 Players z  Bluetooth Applications
PIN CONFIGURATION:  ORDER INFORMATION:
DESIGNATOR SYMBOL DESCRIPTION
① A Standard
② M
Package ：SOT-23-5L Standalone Linear Li-Ion battery charger with Thermal Regulation
CE3150 Series
Tabel1. Pin Description
PIN NUMBER PIN NAME FUNCTION
1 CHG Open-Drain Charges Status Output
2 GND
Ground
3 BAT Charge Current Output. The positive side of battery
4 VCC Input supply Voltage
5 PROG Charge Current Program, Charge Current Monitor
and Shutdown Pin
BLOCK DIAGRAM
BAT CHG
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise specified, Ta=25°C)
PARAMETER SYMBOL RATINGS UNITS
Input Voltage V IN  V SS -0.3~V SS +8 V Prog Pin  Voltage V PROG  V SS -0.3~V IN +0.3 V CHG,BAT Pin  Voltage V BAT  V SS -0.3~V ss +8 V
BAT Pin Current
I BAT  800 mA Power Dissipation
SOT-23-5L
P d  300 mW Operating Temperature T opr  -40~+85 ℃ Junction Temperature T j  125 ℃ Storage Temperature T stg  -40~+125 ℃ Soldering Temperature & Time
T solder
260℃, 10s
ELECTRICAL CHARACTERISTICS
CE3150 Series (V IN = 5.0V, Ta=25℃, Test Circuit Figure1, unless otherwise specified )
PARAMETER  SYMBOL
CONDITIONS
MIN
TYP  MAX
UNITS
Input Supply Voltage
V CC  4.25 5.00 6.50V
Input Supply Current I CC
Charge Mode, R PROG =
10k  200 500 μA Standby Mode(Charge
Terminated)
70 100 μA
Shutdown Mode: R PROG Not Connected, V CC <V BAT , or V CC <V UV
30 50 μA
Regulated Output (Float)
Voltage
V FLOAT  0°C ≤ T A ≤ 85°C, I BAT = 20mA, R PROG =10k
4.158 4.2 4.242V BAT Pin Current I BAT
R PROG  = 10k, Current Mode 115 120 135 mA R PROG  = 2k, Current Mode
540 600 660 mA Standby Mode, V BAT  = 4.2V 0 -2.5 -6.0 μA Shutdown Mode (R PROG  Not Connected)
±1 ±2 μA Sleep Mode, V CC  = 0V
±1 ±2 μA Trickle Charge Current I TRIKL  V BAT < 2.9V, R PROG  = 2k 20 50 70 mA Trickle Charge Threshold V TRIKL  R PROG  =10k, V BAT  Rising    2.8    2.9    3.0 V Trickle Charge Hysteresis V TRHYS  R PROG = 10k
80  mV VCC Under voltage Lockout Threshold
V UV
V CC  from Low to High
3.7
3.8
3.9
float up
V VCC Under voltage Lockout Hysteresis
V UVHYS    100  mV Manual Shutdown Threshold
V MSD
P ROG  Pin Rising
1.21
V
TYPICAL APPLICATION CIRCUITS
Figure1 Basic Application Circuit
OPERATION
The CE3150 is a standalone linear Li-on
battery charger with thermal regulation. It can
deliver up to 800mA of charge current (using a
good thermal PCB layout) with a final float voltage
accuracy of ±1%.
No blocking diode or external current sense
resistor is required. A charge cycle begins when
the voltage at the VCC pin rises above the UVLO
threshold level and a 1% program resistor is
connected from the PROG pin to ground. If the
BAT pin is less than 2.9V, the charger enters
trickle charge mode. In this mode, the CE3150
supplies approximately 1/10 the programmed
charge current to bring the battery voltage up to a
safe level for full current charging. When the BAT
pin voltage rises above 2.9V, the charger enters
constant-current mode, where the programmed
charge current is supplied to the battery. When the
BAT pin approaches the final float voltage (4.2V),
the CE3150 enters constant-voltage mode and the
charge current begins to decrease. When the
charge current drops to 1/10 of the programmed
value, the charge cycle ends.
After a charge cycle is complete and charging
operation is terminated, the CE3150 keeps
monitoring the BAT voltage. If the battery voltage
drops below 4.05V, a recharge cycle will begin. To
manually restart the charge cycle, the input
voltage must be removed and reapplied, or the
charger must be shut down and restarted by
momentarily floating the PROG pin.
APPLICATION  INFORMATION
PROGRAMMING CHARGE CURRENT
The charge current is programmed using a
single resistor from the PROG pin to ground. The
battery charge current is 1200 times the current
out of the PROG pin. The program resistor and
the charge current are calculated using the
following equations:
R PROG =    V
I CHG
I PROG =    V
R PROG

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